Alpha Key Premiere Pro

[Cristoforo Kanoy]

Ihave a ton of webm files that have alpha channels and work in OBS and a friend made a transparent video frame with smoke over it for us to use that does indeed have an alpha channel but when I import it to premiere pro, it doesn't have an alpha channel. I had to install fnord's webm for premiere pro plugin to even import the webm but even so, I cannot use/import any videos with alpha.

Does anyone have any ideas how to get this working? I find it ridiculous that I've already spent a whole day looking for a solution with still no results. You'd think such a great video editor would have no problem doing this.

In doing some testing, it appears Premiere does not support reading WebM alpha channels. Bringing in a Webm with an alpha, Premiere reports it does not have an alpha. Even Mediainfo does not detect the alpha channel.

I will try to contact them but that doesn't seem like it'll lead to much sadly. There has to be another method to allow this though, it doesn't make sense not to lol. Do you know of any other methods or work arounds?

Premiere does not support WebM. The plugin does. This isn't something Adobe can fix. What sort of work around are you looking for? I would simply use another Alpha-capable format that is natively supported by Adobe.

I'm looking for literally any XD What other alpha capable formats does premiere natively support? I feel like this is something adobe can fix with their multiple millions of dollors and the face they created the software though if they really wanted to. Okay maybe not "fix" but integrate into support lol.

I don't think it's fair for you to use a third party plugin, have that plugin fail, then blame Adobe. Adobe has never natively supported Webm and to assume they should "fix" something from another developer seems a bit presumptious. Regardless of how many "millions" they have.

and im not blaiming adobe for the plugin, I'm stating Premiere Pro and After Effects should support as many formats as possible since it is a professional video editor and I'm not saying adobe has to "fix" anything I'm simply stating it's surprising that they do not support this format natively because it's a limitation that doesn't have to there and is rather frustrating to have such a limitation when the software costs so much. My post's main point has nothing to do with the plugin, I'm merely stating that is what I used since it does not support it natively and I wish it did and am looking for any work around to be able to use my footage in premiere since it is my favorite video editor and what I know best. My point is as the creators of premiere pro it couldn't be that hard for them to add/develop the ability for the software to support more formats including webm with alpha.

However, just because you WANT them to support a file type doesn't mean they do, or can, or will. It's not up to you or I to determine "it couldn't be that hard to add it." If it wasn't hard, I'm sure they would have. If it wasn't hard, I bet the developer of that plugin would have it fixed by now too. So I'm guessing it's harder than we thought and Adobe doesn't want to release half baked support (like fNord).

I installed the webm plugin.

Did the linked tutorial to convert to frames with FFMPEG and import frames as sequence.

If the webm has audio, I am able to import original webm after importing the converted frames from the tutorial I linked.

Discard the video imported from the webm. Keep the audio and align it with the imported frames.

Do all the editing I want. Then export webm. It keeps transparency and audio.

I've imported a graphic, ProRes 4444 with an alpha channel but Premiere 6.0.2 is not reading the transparency. When I lay it on top of another clip the transparent part shows as black rather than being transparent and showing the layer underneath. It seems like the same error is happening in After Effects.

- place your footage with lost alpha below the nested sequence inside your main timeline, apply Track Matte Key effect on it and set Composite Using to Matte Luma - that's not perfect but somehow works.

Thanks for your reply but I'm looking for an answer from Adobe on this possible bug, not a workaround since I can get it to work perfectly as expected in Final Cut. The graphic has black in it in any case.

I just created a file with alpha, exported it from Premiere Pro CS6 with the ProRes 4444 codec and it works as expected when imported back into Premiere Pro or After Effects. Where was the file created? How was the file exported? If it was exported from AME, was it exported with 32bit color? Was the render at maximum bit depth checkbox checked? If exported from QuickTime did you have the Millions of Colors+ option enabled?

Try to import your footage into After Effects and see if Alpha channel is properly interpreted with either Straight or Premultiplied options under Interpret Footage -> Main... -> Alpha settings - the bug is claimed being fixed.

As I suspected, the graphic was not exported with an alpha channel. It appears that Apple has changed the export dialog box. For export, choose ProRes 4444. Then go to the render tab and choose Color > Color + Alpha as described in this video:

I came to the conclusion when I saw your Motion project inside FCP7 with the alpha. I'm assuming it's not a rendered file, but the Motion file sitting on the Timeline. Yes? When viewed this way the alpha channel is interpreted automatically when used in a FCP project. When you export the file, the alpha is lost unless you do so with an alpha channel. That's all I'm saying. No matter, it looks like you fixed it.

I didnt solve it. I did a workaround which makes my big client and graphic artist very skeptical of Premiere, which I have been trying to promote. Also gives me more work and bigger files. Trying to champion premiere and getting this response is very disappointing especially after the frustration with all the xdcam ex glitches that took so long to fix.

I also received this same skepticism/denial when I first reported the xdcam bug and an RGB bug. I would think that perhaps that would give me a tiny but if credibility rather than assuming its a user error on my part without really trying to dig deeper in your part. Why

Just received another graphic from the same graphics artist. This time the tranparency was one the first frame of the exported graphic and Premiere sees it and it works as expected. The first file I had problems with only had transparency at the end of the clip. I read in some old posts that there was a bug in a previous version of After Effects where the alpha channel in ProRes 4444 was not working if the first frame had no transparency. Perhaps this is the same issue.

I'm getting another export of the original file with the issues to double check the result in Premiere and will update you on the result, and pass along any files that you need. There is a slightly different menu option to export in the latest Motion version not reflected in the Youtube tutorial, one to use "Same as project," which is what the graphic artist uses and I want to narrow down if this is causing the issue.

I double confirmed the correct settings were being used to export in Motion, the alpha is read in FCP and not Premiere, will send files to Kevin. Premiere seems to read the transparancy when it is at the beginning of the clip, but if it is not on the first frame it ignores it. Thanks everyone for your feedback.

Indeed, it appears that he alpha channel exists in FCP, but not in After Effects or Premeire Pro. How strange! I'll file be sending this to the teams right away. Thanks so much for sending me the files.

Transparency problems seem to be a long standing issue through many incarnations of Premiere Pro CS. I just read a review of CS6 where the professional reviewer brings this up as 1 of the issues that they cannot believe ADOBE has yet AGAIN not fully addressed in CS6.

This is really annoying. I've heard a lot about how Apple have removed a lot of different codec uses including the most needed Quicktime RGB+Alpha one in After Effects. I can no longer import videos with an alpha channel into Premiere. I've tried ProRes 4444 but that didn't work either. All I get is "The importer reported a generic error."

I want to render a short animated scene and import it to Premiere CC, but I cant figure out which output settings bring the results I need, as the video files I got so far can only be played via VLC, all other players fail and Premiere does not import it at all.

Thanks, but what are the exact options that I should make in order to get a proper clip (no image sequence).

I already tried Quicktime, but there are several other options, regarding codecs, container etc.

If you want an alpha channel you need to use a codec that supports an alpha channel (basically limited to quicktime animation or quicktime png codecs), then in output settings select RGBA (the A so yo get the alpha channel included in the output), set the audio codec settings, then render it

I'm working on a project which should create a dynamic mask of the object(s) of focus (or mimic one). So far, I have the functionality to get the data of coordinates of pixels corresponding to that object from the Lucas-Kanade method. Basically, I have a two-color video, one color the dynamic "mask" of the object and the other of the background. Likewise, I have this data as a binary matrix.

Does anyone know the method to create an alpha matte in premiere script like you can do in AE. I've given up on an actual mask as I don't know of any file types which can support transparency. If it's not possible, perhaps there is a better method to mimic a mask; that'd be even better.

I've checked the guide and dug through what I could of the sample (A lot is a lot to follow honestly, I'm still new to adobe scripting), and I'm at somewhat of an impasse. Any suggestions are appreciated, thank you

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